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Details of Income Statement Items (Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Selling, transport and marketing expenses [Abstract]      
Transport $ 553 $ 497 $ 475
Cost of labor 125 122 119
Other 120 127 128
Selling, transport and marketing expenses 798 746 722
General and administrative expenses [Abstract]      
Cost of labor 172 170 188
Professional Services 44 49 77
Other costs 41 42 56
General and administrative expenses 257 261 321
Research and development expenses [Abstract]      
Cost of labor 38 40 48
Other costs 17 15 25
Research and development expenses, net $ 55 $ 55 $ 73